Macromolecular dictionary (mmCIF) version 2.0.09
The method by which the sample for the entity was produced. Entities isolated directly from natural sources (tissues, soil samples etc.) are expected to have further information in the ENTITY_SRC_NAT category. Entities isolated from genetically manipulated sources are expected to have further information in the ENTITY_SRC_GEN category.
Mandatory item: no
The data value must be one of the following:
|entity isolated from a natural source|
|entity isolated from a genetically manipulated source|
|entity obtained synthetically|